Synthesis of Mn1.5Co1.5O4 by Solid State Raction for SOFC Interconnect Applications

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Ahmadi, Sonia | 2016

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 48687 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Faghihi Sani, Mohammad Ali; Nemati, Ali
Abstract:
Interconnects in SOFC’s has oxidation problems which is Because of high temperature operation. Also Cr migration to cathode make chroumiom poisoning problems and all of this affects SOFC’s efficiency. To solve this problem researchers decided to use some protective coating on interconnect. The best group of coatings is Mn-Co Spinels. In this thesis (Mn,Co)3O4 spinels was synthesized via solid state reaction. MC reffered to Mn1.5Co1.5O4 was calcined at 850°C and then sintered at 1200°C. It’s electrical conductivity measured by 4-point probe DC method. It had the lowest ASR (17mΩ.cm2) among other stochiometries. To reduce the sintering temperature, Cu and Y was added as dopants. Among the sintering temperatures Cu-MC (sintered at 1050°C) had the same density that MC (sintered at 1200°C) had. Also Cu-MC had the best electrical conductivity( ASR 14mΩ.cm2). CuY-MC had the same ASR as MC. Y-MC had the lowest electrical conductivity which was because of it’s low density. Y3+ was much bigger than Mn and Co cations and because of that the Y-MC samples had low density and full of pores
Keywords:
Density ; Dopants ; Spinel ; Solid Oxide Fuel Cell (SOFC) ; Area Specific Resistivity ; Cobalt-Manganes Oxides ; Sinterability

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